Bruce,
As a first cut you may want to set CIR equal to port and MINCIR to half that
so when you do get BECNS the router will throttle back (25% of current
bandwidth with every BECN no lower then MINCIR is the algorithm).
This will give some sense that if the cloud or pvc is congested you will
throttle back somewhat. The problem here is how do you slow down the clients
pooring data into the network ie; no mechanism to translate BECN into a TCP
throttle. For this situation you may want to look at WRED which is a
congestion avoidance mechanism that drops packets intermittently on the
offending TCP session, leveraging the TCP sliding window mechanism to close
the window a bit thus throttling back and not tossing data in the router or
the cloud.
good luck!
""Bruce Griffis"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Got a question on traffic shaping. Have a couple high speed frame pipes
> going into data center/server farm locations. Speeds are 9.264MBPS at
> datacenter, 6.176MBPS going into primary server farm, and 4.632MBPS going
> into a less-used server location.
>
> Remote sites are running from 128K to 1.544Meg. I have been playing with
> traffic shaping a bit, and need to make 2 settings. One is for times with
no
> congestion, the second entry is for times with congestion. All sites are
> running zeroK CIR (okay, not my call, but need to support it).
>
> I was thinking for the first stab at it, to make peak speed equal to the
> port speed of the remote location, and average speed equal to average
prime
> shift utilization of the PVC group (look at all 1544 ports, average out
> utilization - then set average to this rate).
>
> * enable traffic shaping, use BECN (Carrier does not use ForeSight)
> int hssi8/0/0
> frame-relay adaptive-shaping becn
> *
> * make the map classes
> * set PEAK at port speed of remote site
> * set AVERAGE at prime shift average utilization at remote site?
> map-class frame-relay 1544K_Port
> frame-relay traffic-rate average 1544000
> * ^
> * |
> * average out prime shift usage for 1.544 ports
> *
> map-class frame-relay 768K_Port
> frame-relay traffic-rate average 768000
> * ^
> * |
> * average out prime shift usage for 768KB ports
> *
> map-class frame-relay 512K_Port
> frame-relay traffic-rate average 512000
> * ^
> * |
> * average out prime shift usage for 512KB ports
> *
> map-class frame-relay 256K_Port
> frame-relay traffic-rate average 256000
> *
> map-class frame-relay 128K_Port
> frame-relay traffic-rate average 128000
> *
> * Apply Traffic-shaping map classes to subinterfaces
> int hssi8/0/0.101
> class 1544K_Port
> *
> int hssi8/0/0.173
> class 512K_Port
> *
> int hssi8/0/0.202
> class 256K_Port
> *
> end
>
>
> Any thoughts (other than buy CIR) - maybe set average to a percentage of
> peak? I don't want to get into custom queue lists and priority queuing
just
> yet. Would need to maybe break out a sniffer and get a look at traffic
then
> work with customer on defining priorities.
>
> Bruce
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